今週のセミナーについてお知らせいたします。

Here is information of the Unagi-seminar(13 June).

************** うなぎセミナーのご案内 (Unagi-seminar) **************

科目：地震学ゼミナールIV（修士・博士）
日時：6月13日（木）14:00～
場所：宇治キャンパス本館E棟2階E-232D
　　　（地震予知研究センター本館セミナー室）

Date and time: 13 June, 14:00 ~
Room: E-232D @ Main building
Map: http://www.uji.kyoto-u.ac.jp/campus/map.html

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[発表者 (Presenter)]
QWANA, Calvin Luiramo　(2nd master degree, fall enrollment)

[題目 (Title)]
Source Mechanism and triggering process for the doublet events in the Solomon Islands on April 12th and 13th 2014

[要旨 (Abstract)]
On the 12th and 13th of April 2014, a pair of earthquakes with magnitude Mw7.6 and Mw7.4, respectively occurred near Makira Island (San Cristobal) in the Solomon Islands. The depth of the main event (Mw7.6) was 27 km and depth of the second event (Mw7.4) was 37 km. We evaluated static stress change from the main event (Mw7.6) on the second event (M7.4). Initially, we determined the slip distributions of the faults for the two earthquakes. The results show that the mechanism for the Mw7.6 first event is left-lateral strike-slip faulting for a plane of strike 116, dip 74, and rake 24. The other NW-SE oriented nodal plane is almost parallel to Australian and Pacific plate boundary. Results for the mechanism of the Mw7.4 event indicates thrust faulting on fault plane-oriented WNW - ESE with two possible nodal planes. The first plane (NP1) has strike 279, dip 46, rake 86 and the second (NP 2) has strike 104, dip 44 and rake 94. The possibility for triggering the second event (M7.4) as influence by the main shock was examined in terms of the Coulomb failure stress function. We calculated the changes in normal and shear stress and obtained a value for the Coulomb failure stress function of +103.46 kPa and +66.64 kPa at the hypocenter for NP1 and NP2, respectively. Both cases show increase of stress which encourage the likelihood of triggering on the recipient fault.
To determine any interrelation between the main event (Mw7.6) and the second event (M7.4) that relate to the role of static Coulomb stress function changes triggered the Mw7.4 earthquake, we also evaluated the aftershocks followed by the Mw7.6 to see if these promote failure in rupturing the planes on the second event (M7.4).

=== 今後の予定(Schedule) ===
20 June : 大柳
27 June : 原、藤田
4 July : 井上、佐脇
11 July : 岡田、栗原、野田
18 July : 森、Farazi、加藤
25 July : 植村、水戸川

(敬称略)